Which two signs should be interchanged to make the below equation mathematically correct?

24 × 12 - 6 ÷ 40 + 20 = 28

Given equation: 24 × 12 - 6 ÷ 40 + 20 = 28.

BODMAS Table: 

Let's check each option one by one.

Option 1) - and +

Given: 24 × 12 - 6 ÷ 40 + 20 = 28

After interchanging the signs we get;

⇒ 24 × 12 + 6 ÷ 40 - 20 = 28

⇒ 24 × 12 + 0.15 - 20 = 28

⇒ 288 + 0.15 - 20 = 28

⇒ 288.15 - 20 = 28

⇒ 268.15 ≠ 28

⇒ LHS ≠ RHS

Option 2) ÷ and -

Given: 24 × 12 - 6 ÷ 40 + 20 = 28

After interchanging the signs we get;

⇒ 24 × 12 ÷ 6 - 40 + 20 = 28

⇒ 24 × 2 - 40 + 20 = 28

⇒ 48 - 40 + 20 = 28

⇒ 68 - 40 = 28

⇒ 28 = 28

⇒ LHS = RHS

Option 3) + and × 

Given: 24 × 12 - 6 ÷ 40 + 20 = 28

After interchanging the signs we get;

⇒ 24 + 12 - 6 ÷ 40 × 20 = 28

⇒ 24 + 12 - 0.15 × 20 = 28

⇒ 24 + 12 - 3 = 28

⇒ 36 - 3 = 28

⇒ 33 ≠ 28

⇒ LHS ≠ RHS

Option 4) + and ÷ 

Given: 24 × 12 - 6 ÷ 40 + 20 = 28

After interchanging the signs we get;

⇒ 24 × 12 - 6 + 40 ÷ 20 = 28

⇒ 24 × 12 - 6 + 2 = 28

⇒ 288 - 6 + 2 = 28

⇒ 290 - 6 = 28

⇒ 284 ≠ 28

⇒ LHS ≠ RHS

Hence, the correct answer is "Option 2".